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Segment, Product and Geographic Information (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 86,673 $ 48,172
Taiwan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 85,808 47,144
China [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 663 767
U.S. [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 33 61
Japan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 19 21
Korea [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 150 $ 179